2025 Fungicide decision making
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As we approach T0, crops look to have broadly come through the winter well, barring areas where winter flooding may have had an impact in low spots.
With active Septoria on lower leaves, a T0 of triazole +/- mildewicide to manage disease early will help slow it down and preserve the yield potential through to T1.
With the decision as to what T1 products to use almost upon us, there are a number of choices which begs the question ‘what to choose?’
3 factors come to play here:
- Overall disease management strategy
- When in the programme are the greatest strengths going to be required
- Cost management
Overall strategy:
The overall strategy ought to take account of the dominant diseases led by environmental conditions, the disease profile for the variety, not relying on a narrow range of chemistries (for resistance management) and matching expenditure to the variety’s response to fungicides. A critical factor amongst this is not overly relying on SDHI + Triazole chemistry. Many products are reliant on SDHI + Triazole such as Ascra, Plaxium®, Ipresso™, Revystar® XE and Miravis® + Era™ and to use any two of these at T1 and T2 does put strong selection pressure on Septoria isolates resistant to triazole and/or SDHI chemistry. The obvious way to break this cycle is the use of Inatreq™ as found in Univoq™.
When in the programme are the greatest strengths required?
Use chemistry with the required strengths at the time you see disease – lots of disease at T1 – use the strongest chemistry to try and create a clean crop at T2. Low disease at T1 might mean leaving the ‘big guns’ to T2 in acknowledgement that T2 applications most often give the biggest returns. As part of the resistance management strategy for Univoq, it can be used once in a crop. Following the logic above, not using it probably risks further SDHI and/or triazole resistance pressures, so the question turns to when to use it?
Its greatest strengths have always been at T2 but if disease pressure is high at T1, Univoq does an excellent job of cleaning up the crop which probably widens the product choice at T2.
Cost management
Growers are already aware that Corteva solutions based on Inatreq, such as Univoq, are excellent value. Much needed in these challenging times. Univoq provides broad spectrum disease control with a unique mode of action at ‘sensible’ cost!
Over 2 million hectares have been treated with Inatreq products since launch and many growers and advisors would not use a programme without it now.
Find out more at www.corteva.co.uk/inatreq
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